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Immunofluorescent methods using a monoclonal antibody against chick DNA polymerase alpha and a rabbit antibody against chick DNA polymerase beta demonstrated that both DNA polymerases alpha and beta are present mainly in nuclei of cultured chick embryo cells. Fluorescence produced by anti-DNA polymerase alpha was more intense in the small granules than in other parts of the nucleus but, fluorescence produced by anti-DNA polymerase beta was distributed evenly in the nucleus. Cells first were treated with Nonidet P-40, followed by treatment with 50 micrograms/ml pancreatic DNase and 2 M NaCl in order to prepare the nuclear matrix. Fluorescence produced by anti-DNA polymerase alpha was still detectable in the granules after these treatments, but most of the fluorescence produced by anti-DNA polymerase beta disappeared. Our results indicate that a part of DNA polymerase alpha is tightly bound to a special structure present in the nuclear matrix which presumably is the DNA replication machinery.

cell structure and function

Tight association of DNA polymerase .ALPHA. with granular structures in the nuclear matrix of chick embryo cell: Immunocytochemical detection with monoclonal antibody against DNA polymerase .ALPHA..